Apparatus for reducing gravel to sand



Aug. 26, 1930. B. J. cooMEs 1,774,318

APPARATUS FOR REDUCING GRAVEL TO SAND Filed Feb. 20, 1928 &

firmrd J 6 00mm),

INVENTQR WITNESS: ATTORNEY Patented Aug. 26, 1930 i uuirsn STATES PATENT carries BERNARD J. COOMES, OF ALGONQUIN, ILLINOIS APPARATUS FOR BEDUGiNG GRAVEL T SAND Application filed February 20 19,281. Serial No. 255,741.

The present invention relates to devices pleting the crushingof the'larger particles for pulverizing gravel and reducing the same which are delivered thereto fromthe rollers to sand. 1.2 and 13 through the instrumentality of a Objects of the invention are to provide efconical-shaped sieve 28 mounted upon a shaft fective means for reducing gravel to sand 29 which is suitably journaled in the casing which will pulverize the gravel and will give by means of bearings 30 and 31 m0unted on a uniform and natural looking result. the walls of said casing. The shaft 29 is ar- Another object is to provide means for subranged diagonally across the casing and the jecting the partially pulverized material to sieve 28 is suitably secured thereto by means 10 a second pulverizing operation. I of the hubs 32 and 33, the sieve 28 being ar-- Further objects are simplicity in construcranged in position beneath the rollers 12 and tion, effectiveness in use and simplicity of op- 13 to receive the product of crushed gravel oration. therefrom and the shaft 29 is rotatable in In the drawings order to effect a separation ofthe fine mate- Figure 1 is a section through the machine rial from the coarscix. The hub receives 35 made in accordance with the principles of cross arms that have their ends secured to the my invention. side edges of the sieve, while the hub 33 se- Figure 2 is a side elevation of the same. cures the apex of the sieve to the shaft 29.

In the drawings, 10 designates a casing The sieve 28 is tilted at'an angle such that havinga hopper 11 in the upper portion therethe coarser material will gradually move toof beneath which are located a pair of pulverward the edge thereof bothunder the infinizing rollers 12 and 13 in cooperative relaence of centrifugal force and by gravitation tion to each other, said rollers being spaced and will be delivered between the rollers 26 apart a distance so as to receive the gravel and 27 where it will be further pulverized therebetween and crush the same as the rollers and delivered to the endless belt 34 upon 70 rotate toward each other. The rotation of which it will be conveyed out of the casing. the rollers is effected through a train of gears Finer material will pass through the. meshes 14, 15, 16, 17 and 18, the latter of which is of the sieve and will be deposited in the botdriven by means of sprockets 19 and 20 about tom of the casing.

which is trained a sprocket chain 21, the The shaft 29 is rotated through the gears 80 sprockets being respectively mounted on and 36, the former being mounted upon shafts 22 and 23. The roller 12 is mounted on the shaft 29 and the latter on a shaft 37 oura shaft 24 to which the gear 14 is connected, naled in the casing and extending through the roller 13 to a shaft 25 to which g 1 one of the walls thereof, said shaft 37 also 35 is connected. carrying the gear 16 described above.

The rollers 12 and 13 are located as fi The roller26 is mounted on the shaft 22 Gated abOVQ in the pp Portlon of the 9 m and the roller 27 on a shaft 38 on which the 10 and adlilcent hopper Lymg m ear 17 is secured. Suitable driving means spaced relation to said rollers 12 and 13 and F be provided and constituting ngpart of 40 in the lower t} 9 the casing 10 is a pair the invention shown. 7 The endle s belt 34 is gi gg gfi i g i gi i sffa i fig ifi g fg: trained about rollers 39 and 10, the latter ii toward i Other the roller 26 in a belng supported by bragkets fll secured to the caslng and the roller 39 belng mounted on clockwise and the roller 27 in an anti-clock v 9 wise direction. The rollers 12 and 13 pulthe,S11aft lournalechm the casmg and GD 95 which the sprocket 20 is secured.

verize the material to a certain degree of 1 l u I J! fineness, part of the material being reduced to The gear 18 15 P lpounlled 0T1 L116 Sflht the fineness of sand and part of which being 92 and meshes Wlth we gear as Stated c a r a size too large to be passed as sand. The Y The gea s 35 and 9 16 protected rollers 26 and 27 perform the function of comagalnst the dust and sand within the casing 1 10 by means of a casing 44 secured in the casing 10.

In operation, gravel is delivered to the hopper 11 by which it is directed between the rollers 12 and 13 which rotate toward each other, the roller 12 in a clockwise and the roller 13 in an anti-clockwise direction. The gravel is crushed between said rollers and is delivered to the sieve 28 which is rotated by the shaft 29. The material is separated by the sieve 28 and in the movement of said sieve, the particles rub against each other wearing of]? to a degree the rougher edges giving the similitude of sand. The finer particles pass through the interstices of the sieve and are delivered to the bottom of the casing or on a trough directed toward the belt 34, and the larger particles a re delivered from the edge of the sieve to and between the l rollers 26 and 27 where they are further acted upon and reduced to the size of grains of sand whereupon the material is delivered to the endless belt and carried out of the hopper.

Having described my invention what I claim is A device for reducing gravel to sand, comprising a casing, a hopper disposed in the upper portion of said casing, a pair of crushing rollers arranged below said hopper, a shaft ournaled at an inclination in said casing, a conical shaped sieve secured to said shaft between the ends of the latter and disposed below said crushing rollers to receive material therefrom, hubs for the sieve and secured to the shaft, cross arms secured to one hub and the side edges of the sieve, a pair of crushing rollers below said sieve to receive unsiited material discharged over the outer and lower edge thereof, a conveyor below the last mentioned crushing rollers. means for rotating the crushing rollers, sieve and conveyor simultaneously, the sieve rotating means including a gear secured to the shaft, a gear meshing with the gear first mentioned and a housing for said gears.

In testimony whereof I affix my signature.

BERNARD J. o'ooMEs. 

